var. aurantiifolia. East
Indian
Archipelago where it is apparently indigenous. From there it has
spread by human help to the Asiatic mainland and to many other
tropical or subtropical regions of the world. It is a distinct
species, not closely related to any other species of Citrus. Common
name: Lime.

Citrus × limon (L.)
Osbeck, Reise Ostindien (1765) 250; --Citrus medica var. limon L., Sp.
Pl. (1753) 782; --Type: from Europe? (LINN). --Citrus × limonia Osbeck,
Reise Ostindien (1765) 250; --Merr., EPFP 2 (1923) 343. Widely
cultivated in all subtropical countries. The origin of the lemon is
a mystery. Probably it should be considered as a satellite species of
the citron; possibly it may prove to be of hybrid origin, perhaps having
the citron and the lime for parent species. Here not considered native
to the Philippines and not naturalized. Photos